BERLIN—Several European Union nations on Sunday banned flights from the UK and Germany was considering limiting such flights to make sure that a new strain of coronavirus sweeping across southern England does not establish a strong foothold on the continent. The Netherlands banned flights from the UK for at least the rest of the year while Belgium issued a flight ban for 24 hours starting at midnight and also halted train links to Britain, including the Eurostar. Austria and Italy said they would halt flights from the UK but did not give details on any timing of the ban. Italian Foreign Minister Luigi Di Maio said on Twitter that the government was preparing the measure “to protect Italians” from the new coronavirus variant. About two dozen flights were scheduled to arrive in Italy on Sunday, most in the northern region of Lombardy but also in Veneto and Lazio, which include …